Decolorizing substance



Patented dune E6, 1931 nnrr WOLF KBITSKY, OF CHICAGO, ILLINOIS, ASSIGNOR T0 BIT PRODUCTS COBEOBA- TION, 01E CHICAGO, ELINOIS, A CORPORATION OF DELAWARE ZDECDLORIZING SUBSTANCE Ho Drawing.

My invention relates to decolorizing or stripping compounds and particularly to an improvement on the composition disclosed in U. S. Patent No.'1,524,737 of February 3, 1925.

1n the United States patent above identi-.

I have described, but that it will greatly increase the eiliciency of a mixture of an acid reacting compound and the plain hydro-sulphite; this'also applies to a mixture of zinc dust or any other reducing metal and sodi um bisulphite. In general, my idea is to produce acomposition of matter consisting of a chemical oi the constitution described, having a high wetting power, and a chemi cal or mixture or" chemicals of the hydrosulfite class that will act as reducing agents.

As illustrations-of efiective compounds, a few examples are given:

1. 8 oz. of sulphonylate formaldehyde of zinc, 8 oz. of sodium hisulphite, 1 oz. oi isopropyl-naphthalene sodium sulphonate.

2. oz. of sodium hydrosulphite, oz. of sodium sulphite, 1 oz. of iso-propyl naphthalene sulphonic acid;

3. 5 oz. of sulphoxylate-formaldehyde of zinc or some other metal, 10 oz. of aluminum sulphate, 1 oz. of hutyl naphthalenesodiuin sulphonate.

i. 1 oz. dust, 4 on. sodium bisulphite, X oz. of iso-anyl-naphthalene sodium sulphonate.

Of the'products specified in the exam ples, some are soluble in water, while others are not. Those that are water soluble go into reaction immediately upon solution Application filed December 7, 1328. Serial No. 324,581.

in water, while those that are not water soluble develop their hydrogen gradually upon heating. 7

The proportions mentioned in the examples may be varied with wide limits and the chemicals mentioned therein may be substituted by their equivalents.

I claim:

1. A composition of matter for strippin of color comprising a sulphonic acid salt 0 an allrylated polynuclear hydrocarbon, having a high wetting power, and a chemical of the hydrosulfite class that will act as a reducing agent. A

2. A composition of matter for stripping of color comprising a salt of sulphonated allryl- Y ated naphthalene and a chemical of the hyv drosuliite class that will act as a reducing agent.

3. A d e stripping agent comprising sodium hy rosulphite and iso-propyl naphthalene sodium sulphonate.

l. A composition of matter comprising sodium' sulphoxylate formaldehyde and isopropyl naphthalene sulphonic aci 5. A color stripping agent comprising sodium salt of iso-propylnaphthalene sulphonic acid, basic zinc sulphoxylate formaldehyde, and a solid having an acid reaction.

5. The process ofstripping fabrics which consists in treating the fabric in an aqueous medium to which is added a composition of matter comprising a sulphonic acid salt of an 'alkylated polynuclear hydrocarbon having great wetting power and a chemical of the hydrosulfite class, and then when the color is stripped removing the garment, washing it free from the chemicals, and drying.

lln'testimony whereof I have afixed my WOLF KRITCHETVSKY.

7 Signature. 

